package com.wy.system.filter;

import com.alibaba.fastjson.JSON;
import com.wy.common.result.Result;
import com.wy.common.result.ResultCodeEnum;
import com.wy.common.utils.JwtHelper;
import com.wy.common.utils.ResponseUtil;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.util.StringUtils;
import org.springframework.web.filter.OncePerRequestFilter;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;

public class TokenAuthenticationFilter extends OncePerRequestFilter {
  private RedisTemplate redisTemplate;

  public TokenAuthenticationFilter(RedisTemplate redisTemplate) {
    this.redisTemplate = redisTemplate;
  }
  @Override
  protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain chain)
      throws IOException, ServletException {
    logger.info("uri:"+request.getRequestURI());
    //如果是登录接口，直接放行
    if("/admin/system/index/login".equals(request.getRequestURI())) {
      chain.doFilter(request, response);
      return;
    }

    UsernamePasswordAuthenticationToken authentication = getAuthentication(request);
    if(null != authentication) {
      SecurityContextHolder.getContext().setAuthentication(authentication);
      chain.doFilter(request, response);
    } else {
      ResponseUtil.out(response, Result.build(null, ResultCodeEnum.PERMISSION));
    }
  }

  private UsernamePasswordAuthenticationToken getAuthentication(HttpServletRequest request) {
    // token置于header里
    String token = request.getHeader("token");
    logger.info("token:"+token);
    if (!StringUtils.isEmpty(token)) {
      String username = JwtHelper.getUsername(token);
      logger.info("username:"+username);
        if (!StringUtils.isEmpty(username)) {
          String authoritiesString = (String) redisTemplate.opsForValue().get(username);
          List<Map> mapList = JSON.parseArray(authoritiesString, Map.class);
          List<SimpleGrantedAuthority> authorities = new ArrayList<>();
          for (Map map : mapList) {
            authorities.add(new SimpleGrantedAuthority((String)map.get("authority")));
          }
          return new UsernamePasswordAuthenticationToken(username, null, authorities);
      }
    }
    return null;
  }
}
